Year	% of population
2001	11.8
2002	11.6
2003	11
2004	10.4
2005	9.8
2006	8.9
2007	8.9
2008	8.4
2009	8.1
2010	8.1
2011	8.4
2012	8.4
2013	8
2014	8.4
2015	9
2016	9.7
2017	9.7
2018	9.2
2019	9
2020	9.1
2021	9